Curb fob millstones



0. L. RICHARDSON.

- Ventilating. Curb for Millstones.

No. 29,617. Patented Au 14,1860.-

UNITED STATES PATENT OFFICE.

O. L. RICHARDSON, OF ATHENS, GEORGIA.

CURB FOR MILLSTONES.

Specification of Letters Patent No. 29,617, dated August 14, 1860.

To all whom it may concern:

Be it known that I, O. L. RICHARDSON, of Athens, in the county of Clark and State of Geor ia, have invented a new and Improved Ventilating-Curb for Millstones; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which Figure 1 is a Vertical section of my invention, taken in the line as, m, Fig. 2. Fig. 2, a horizontal section of the same taken in the line 2, 3 Fig. 1.

Similar letters of reference indicate corresponding parts in the two figures.

The object of this invention is to obtain a simple and efiicient device for admitting of the perfect ventilation of the mill stones, that is to say, the admitting of a current of air through or between the stones while in operation, so as to keep the same in a cool state, and thereby avoid heating the meal and consequently enabling the grinding operation to be considerably expedited.

To enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A, represents a bed stone, and B, a runner or upper stone. These stones may be con structed and arranged in the usual way and therefore they do not require a minute description.

C represents the curb which encompasses the runner or upper stone B, as shown clearly in Fig. 1. This curb is formed of two parts a, Z). The part a, is simply a hollow cylinder or drum constructed of sheet metal or wood. This part a, forms the body of the curb. The part b, is the top portion and it is slightly dish-form and is provided with a pendent flanch 0, which extends down a suitable distance all around it, the fianch 0, being of less diameter than the part a, so as to leave a space (Z, between them and the top extending or projecting over the part a, as shown clearly in Fig. 1. Within this space d, there are secured at proper distances apart a series of ribs D. These ribs or fans may be of wood or metal, and they are secured in proper position by screws 6, wh ch pass through the part a, through the ribs, and into the flanch c, said screws also securing the two parts a, Z), of the curb together as plainly shown in Fig. 1. The screws 6, pass through oblong vertical slots f, in the part a, to admit of a certain degree of vertical adjustment of the part b.

The part b, of the curb may be of metal or wood, and in the center of the part b, there is a circular opening 9, having a vertical fianch h, around its upper edge, and a tube E, fitted therein. The tube E, extends down into the eye 2', of the runner B, and is secured in proper position by means of set screws j, which pass through the fianch h, as shown clearly in Fig. 1.

The operation is as follows: As the upper stone or runner B, is rotated a draft is generated by the rotation of the runner and a current of air passes down the eye 2', of the runner B, between the two stones A, B, and into the space (Z, between the runner and curb, and out through the upper end of said space as indicated by the red arrows. The tube E, serves to cut off all communication between the eye 2', and the space between the top of the runner and the curb, thereby compelling the draft to pass in the direction indicated. The curb may be adjusted to suit runners of varying heights, the tube E, being made adjustable for the same purpose.

By this simple device herein described I obtain all the effect produced by the expensive ventilating apparatus that have been previously devised.

I do not claim broadly the employment of wings or fans upon the peripheries of mill stones for creating a current of air; but

Having thus described my invention what I claim as new and desire to secure by Letters Patent is- The employment of a curb C, composed of two parts a, b, the upper part 7), being provided with a fianch c, and the two parts a, 6, being separated by the interposed ribs or fans D, leaving an air space d, and an air escape orifice at the upper edge of the part a, over which the edge of the part 1), projects all as herein shown and described for the purpose set forth.

0. L. RICHARDSON.

Witnesses:

REUBEN NIOKERSON, JOHN KIRKPATRICK. 

